Siemens 7SA511 manual Deactivating Parameter Changeover, Power System Settings

7SA511 Line Protection Relay Programming the Relay

3.Press the Nokey until the setting you want is displayed, then press Enterto select the active parameter set. Table 5-6 identifies the parameter set presetting and options.

Table 5-6.Parameter Changeover Options.

Addr.	LCD Text	Description
8503	ACTIVATION	Select the active parameter set

Preset

SET A

Options

SET B

SET C

￿SET D

SET BY BIN. INPUT

4.Save the new active parameter set per the instructions in section 5.3.4. If “SET BY BIN. INPUT” is selected, see the “Settings Calculation” chapter for further instructions required to perform parameter changeover via binary inputs.

Important: After a new parameter set has been selected as the active set, the parameter set ID prefix displayed for addresses 1000 to 3999 will not change until the relay has been through a reset and restart cycle (see “On/Off Switch” in the “Product Description” chapter). Therefore, you cannot count on the prefix to indicate the correct active parameter set at all times. Only the value at address 8501 is always an accurate indication of the active set.

5.8.3 Deactivating Parameter Changeover

If you change the parameter at address 7885 to NON-EXIST, parameter changeover is deacti- vated. The parameters between addresses 1000 and 4000 will no longer display an address number with the parameter set ID (A - D) preceding it. However, the active parameters will remain those of the last active set. To restore the relay to the ORIG.SET, you must set address 7885 to EXIST, copy the ORIG.SET to set A, B, C, or D, activate that set via address 8503, and then deactivate parameter changeover.

5.9 System Settings

System settings provide information to the relay about the characteristics of the power system to which the relay is connected and intended to protect. You can also change the sensitivity of the measured values monitoring function as needed.

For detailed information on calculating system settings, refer to Reference A, “Method of Opera- tion,” and to Reference E, “Setting Calculations.” All equations used to calculate the setting values are included in one or both of these sections.

5.9.1 Power System Settings (1100)

The protected system’s rated frequency (60 or 50 Hz) is set at address 7899 as part of the relay’s scope of functions (see section 5.6). The remaining power system settings for the 7SA511 relay are in address block 1100. If you change any of these settings, the relay will automatically reset and restart after the “NEW SETTINGS SAVED” message is displayed. Table 5-7 identifies the system presettings and the available setting options and ranges.

5-22 July 27, 1995